Class 6 Maths Chapter 5 Understanding Elementary Shapes Exercise 5.3 pdf notes:-

**Exercise 5.3** Class 6 maths Chapter 5 Pdf Notes:-

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## Ncert Solution for Class 6 Maths Chapter 5 Understanding Elementary Shapes Exercise 5.3 Tips:-

**Introduction:-**

Angles ā āAcuteā, āObtuseā and

āReflexā

We saw what we mean by a right angle and

a straight angle. However, not all the angles

we come across are one of these two kinds.

The angle made by a ladder with the wall

(or with the floor) is neither a right angle

nor a straight angle.

Think, discuss and write

Are there angles smaller than a right angle?

Are there angles greater than a right angle?

Have you seen a carpenterās square? It looks like the letter

āLā of English alphabet. He uses it to check right angles.

Let us also make a similar ātesterā for a right angle.

Suppose any shape with corners is given. You can use your RA tester to test

the angle at the corners.

Do the edges match with the angles of a paper? If yes, it indicates a

right angle.

The hour hand of a clock moves from 12 to 5.

Is the revolution of the hour hand more than

1 right angle?

**Try These:-**

- What does the angle made by the hour hand of the clock

look like when it moves from 5 to 7. Is the angle moved

more than 1 right angle? - Draw the following and check the angle with your RA tester.

(a) going from 12 to 2 (b) from 6 to 7

(c) from 4 to 8 (d) from 2 to 5 - Take five different shapes with corners. Name the corners. Examine

them with your tester and tabulate your results for each case :

Do you see that each one of them is less than one-fourth of a revolution?

Examine them with your RA tester.

If an angle is larger than a right angle, but less than a straight angle, it is

called an obtuse angle. These are obtuse angles.

Do you see that each one of them is greater than

one-fourth of a revolution but less than half a revolution?

Your RA tester may help to examine.

Identify the obtuse angles in the previous examples too.

A reflex angle is larger than a straight angle.

It looks like this. (See the angle mark)

Were there any reflex angles in the shapes you made earlier?

How would you check for them?